Koo-Yong Park

Ji, H.W.; Kim, H.J., and Park, K.Y., 2020. Lateral behavior analysis due to differential deflection between jetty structures In: Malvárez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 1–5. Coconut Creek (Florida), ISSN 0749-0208.Particular attention shall be paid to the design of steel/concrete structures supporting piping or equipment which have a sensitiveness to deflection. In case of excessive displacement generated in the substructure, the supported topside facilities can be subjected to additional stress caused by the imposed-deformation. Therefore differential deflection between structures should be estimated and then to be considered in the topside facilities. However, it is incredibly difficult for designer to predict the lateral behavior of the structures, using existing simple ways, under environmental and seismic load. Therefore a rigorous analysis should be performed to investigate the lateral behavior of the structures.

As devastating and unpredictable tsunamis generated by underwater earthquakes are occurring more frequently, the need for tsunami disaster prevention measures is rapidly increasing. In this study, tsunami heights were estimated, and the best-fit distribution was examined through a combination of numerical analyses and statistical methods. A numerical model was employed to estimate the tsunami heights, and the parameters were estimated using the method of L-moments applied to the estimated tsunami heights. The best-fit distribution was determined by applying the estimated parameters to the L-moment ratio diagram. The study areas were the Imwon Port and the Sadong Port located in the eastern part of the Korean Peninsula. The tsunami height distribution was represented by a log-normal distribution for the Imwon Port, whereas the distribution was represented by a generalized Pareto distribution for the Sadong Port. The study indicates that the distribution most commonly suggested by previous studies, i.e., the log-normal distribution, is not always accurate. Therefore, when performing statistical analysis on tsunami heights, the assumption of a log-normal distribution should be considered carefully.

To investigate the run-up heights of nearshore tsunami on the lee side of a circular island, a model has been developed on quadtree grids. The model is based on the Liu et al. using the shallow water equations. The result has been validated experimentally and numerically. The good agreement has been achieved. It should be noted that the run-up heights are mostly dependent on the crest length of incident waves when the crest length is less than the base diameter of the island but are almost insensitive if the crest length is greater than twice the base diameter.